萝卜胞质不结球白菜雄性不育材料黄化缺陷的改良研究

A STUDY ON IMPROVING THE YELLOWING ABNORMALITY OF BRASSICA CAMPESTRIS SSP.CHINENSIS WITH RADISH MALESTERILE CYTOPLASM

1988～1990年3年的试验研究结果表明:在萝卜细胞质遗传背景下,不结球白菜黄化现象的遗传以基因加性效应为主,兼有部分显性效应;黄化现象的广义遗传力为87.6%,狭义遗传力为67.73%.改良黄化缺陷的育种方法应从改良 F_1代母本基因型和筛选适宜父本两方面进行。系统选择的方法改良母本不育系,在早期世代较有效,但在高世代的效果不显著;届时若采用新轮回亲本更换原保持系,则效果明显,并获得了黄化轻微的胞质不育系。用广泛测交的方法筛选父本,获得了10个对萝卜胞质黄化敏感性弱的品种,其中4个品种的综合经济性状亦较好,宜应用于秋菜或秋冬菜栽培季。

Experiments from 1988 to 1990 led to the following results.Undcr thc radish CMS cytoplasmgenetic backgrounds,the additative genetic effects of the yellowing in Brassica campestris ssp.chinensis wasmore important than the partial dorminant effects.The broad and the narrow heredity were 87.6% and67.73%,respectively.Thus,it was thought that the yellowing of thc hybrids could be improved by allevi-ating the yellowing of the CMS line and scrccning the paternal genotypes obtusely sensitive to the yellowing.Effective improving the yellowing of the CMS lines could be attained by the pedigree selection in the lowergenerations and by changing their recurrent parents in the higher generations.10 suitable paternal cultivarswere screencd out and 4 of them with higher combine ability could be used for producing hybrids suitable forautumn or autumn-winter cultivating seasons.